Specifications

Pear-Shaped Separatory Funnel · Specifications

Standard sizes are listed below. All products comply with GB/T, ASTM, and ISO standard taper systems. Full range 10/19 ~ 60/45 available. Custom capacities, joint sizes, and seal materials are available.

Request custom specs

1. Seal Material Configurations

Component	Material	Typical Use	Features
Top Stopper	Glass	Standard organic solvents	High clarity, resistant to most organics
	PTFE	Strong acids, bases, aggressive systems	Resists all chemicals, no lubrication
	Plastic	General use, budget-conscious	Lightweight, low cost
Bottom Stopcock	Glass	Standard organic solvents	Requires grease, cost-effective
Bottom Stopcock	PTFE	Strong acids, bases, aggressive systems	Resists all chemicals, no lubrication, excellent seal

2. Pear-Shaped Separatory Funnel Sizes

Note: Top stopper and bottom stopcock materials can be freely combined. No.22 and No.27 are special sizes for separatory funnels — shorter and resistant to seizing.

Capacity (ml)	Joint Size	Stopcock Bore (mm)	Stem O.D. (mm)	Top Stopper	Bottom Stopcock
10	10/13 or 19/26	2	8	Glass/PTFE/Plastic	Glass/PTFE
25	14/20 or 19/26	2	—	Glass/PTFE/Plastic	Glass/PTFE
60	14/15 or No.16	2	10	Glass/PTFE/Plastic	Glass/PTFE
125	No.22 or 19/22	2	—	Glass/PTFE/Plastic	Glass/PTFE
250	No.22 or 24/29	4	—	Glass/PTFE/Plastic	Glass/PTFE
500	No.27 or 24/29	4	—	Glass/PTFE/Plastic	Glass/PTFE
1000	No.27 or 24/40	4	8~9	Glass/PTFE/Plastic	Glass/PTFE
2000	No.38 or 29/32	4	—	Glass/PTFE/Plastic	Glass/PTFE
3000	34/35	—	—	Glass/PTFE/Plastic	Glass/PTFE
5000	—	—	—	—	—
10000	—	—	—	—	—

3. Standard Joint Specifications (GB/ASTM/ISO)

GB/T	ASTM	ISO
14#	14/20	14/23
19#	19/22	19/26
24#	24/40	24/29
29#	29/42	29/32

* Joint numbers (14#, 19#) indicate the largest diameter (mm) of the taper. All are 1:10 taper.
* GB/ASTM/ISO designations are different standard identifiers — physical dimensions are identical and fully interchangeable.
* No.22 and No.27 are special sizes for separatory funnels — shorter and resistant to seizing.
* Top stopper and bottom stopcock materials can be freely combined.
* Contact our sales team for MOQ and lead time on custom orders.

✦ Customization Services — We offer custom capacities, joint sizes, stopper and stopcock materials. Share your specific requirements and our technical team will provide a tailored solution.

Product Description

The pear-shaped separatory funnel is the standard apparatus for liquid-liquid extraction in the lab. Its pear-shaped (Squibb) body provides a clear interface between layers, making phase separation accurate and easy. Manufactured from high-borosilicate glass 3.3 with a short neck and precision-ground standard taper joints, it features a stopcock for precise flow control.

The top stopper is available in glass, PTFE, or plastic to suit different chemical systems, while the bottom stopcock is available in glass or PTFE for optimal chemical compatibility. Joint sizes No.22 and No.27 are specially designed for separatory funnels — shorter and resistant to seizing.

✦ Customizable Seal Configuration: Top stopper (Glass/PTFE/Plastic) and bottom stopcock (Glass/PTFE) can be freely combined to meet the specific chemical resistance and sealing requirements of your application.

Key Features

Borosilicate Glass 3.3: Meets ISO 3585, low thermal expansion, thermal shock resistance, excellent chemical durability
Pear-Shaped Design: Clear phase separation interface for accurate extraction
Short Neck: Minimizes liquid retention, ideal for extraction operations
Top Stopper Options: Glass (organic solvent compatible, high clarity), PTFE (resists all chemicals, no lubrication), Plastic (lightweight, cost-effective)
Bottom Stopcock Options: PTFE (resists acids/bases, no lubrication, excellent seal) or Glass (organic solvent compatible, cost-effective)
Standard Joint: 1:10 taper, fully interchangeable, reliable sealing

Quality Assurance

Each pear-shaped separatory funnel is inspected for dimensional accuracy, stopcock seal integrity, and taper precision to ensure reliable sealing with all standard joint components. Custom bulk orders are welcome.

Tip: Check stopcock rotation and stopper seal before use. Glass stopcocks may require a thin layer of vacuum grease; PTFE stopcocks require no lubrication. Remember to vent during shaking to prevent pressure buildup.

Applications

Typical Uses

Liquid-Liquid Extraction

Isolate target compounds from reaction mixtures — pear-shaped design for clear separation

Washing Operations

Wash organic phases with acid, base, or brine

Continuous Extraction

Combine with condensers and distillation heads

Pharmaceutical R&D

Purification of drug intermediates and APIs

Teaching Labs

Organic and inorganic chemistry education

Compatible Equipment

Standard joint flasks, condensers, distillation heads

Ring stands and clamps

Vacuum pumps (for vacuum extraction)

Tip: Always use matching standard joint sizes for optimal sealing. For volatile solvents, operate in a fume hood and vent frequently during shaking.

Operation & Maintenance

User Guide

Before Use

Inspect for cracks, chips, or scratches
Check stopcock rotation and ensure it is closed
Verify stopper seal
Glass stopcock: apply thin vacuum grease if needed
PTFE stopcock: no lubrication needed

Extraction Procedure

Add solution and extractant, insert the stopper
Shake gently (with venting) to mix phases
Allow layers to separate, then drain the lower layer through the stopcock
Pour the upper layer out through the top

Venting

After shaking, point the funnel away from yourself, slowly open the stopcock to release pressure
Repeat until pressure is equalized

Cleaning & Storage

Clean immediately after use to prevent residue buildup
Use soft brushes and mild detergents; never use abrasive materials
Air dry and store with protective paper between ground joints
For long-term storage, remove the stopcock